/* ---- Editorial theme ----------------------------------------------------
   Warm paper, serif display headings, sans-serif navigation, green accents.
   Fonts: Source Serif 4 (body, set in mkdocs.yml), Newsreader (display),
   Inter (navigation and UI), JetBrains Mono (code).                        */
@import url("https://fonts.googleapis.com/css2?family=Newsreader:opsz,wght@6..72,400;6..72,500&family=Inter:wght@400;500;600&display=swap");

:root,
[data-md-color-scheme="default"] {
  --eor-paper: #f6f4ef;
  --eor-ink: #1c1c1a;
  --eor-ink-soft: #4a4a45;
  --eor-rule: #e0dbd0;
  --eor-accent: #2d6a4f;
  --eor-display: "Newsreader", "Source Serif 4", Georgia, serif;
  --eor-ui: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --md-default-bg-color: var(--eor-paper);
  --md-default-fg-color: var(--eor-ink);
  --md-default-fg-color--light: var(--eor-ink-soft);
  --md-default-fg-color--lighter: #8a877e;
  --md-default-fg-color--lightest: var(--eor-rule);
  --md-primary-fg-color: var(--eor-paper);
  --md-primary-fg-color--light: #fbfaf7;
  --md-primary-fg-color--dark: #e9e5dc;
  --md-primary-bg-color: var(--eor-ink);
  --md-primary-bg-color--light: var(--eor-ink-soft);
  --md-accent-fg-color: #1f5038;
  --md-typeset-a-color: var(--eor-accent);
  --md-code-bg-color: #efece5;
  --md-footer-bg-color: #ebe7de;
  --md-footer-bg-color--dark: #e3ded3;
  --md-footer-fg-color: var(--eor-ink);
  --md-footer-fg-color--light: var(--eor-ink-soft);
  --md-footer-fg-color--lighter: #8a877e;
}

[data-md-color-scheme="slate"] {
  --eor-paper: #141513;
  --eor-ink: #e8e6e0;
  --eor-ink-soft: #b5b2a8;
  --eor-rule: #2c2d29;
  --eor-accent: #84c2a1;
  --md-default-bg-color: var(--eor-paper);
  --md-default-fg-color: var(--eor-ink);
  --md-default-fg-color--light: var(--eor-ink-soft);
  --md-default-fg-color--lighter: #7d7a72;
  --md-default-fg-color--lightest: var(--eor-rule);
  --md-primary-fg-color: var(--eor-paper);
  --md-primary-fg-color--light: #1b1c19;
  --md-primary-fg-color--dark: #0f100e;
  --md-primary-bg-color: var(--eor-ink);
  --md-primary-bg-color--light: var(--eor-ink-soft);
  --md-accent-fg-color: #a6d8bc;
  --md-typeset-a-color: var(--eor-accent);
  --md-code-bg-color: #1c1d1a;
  --md-footer-bg-color: #0f100e;
  --md-footer-bg-color--dark: #0b0c0a;
}

/* Header: paper-coloured bar with a hairline, not a coloured slab. */
.md-header {
  background-color: var(--md-default-bg-color);
  color: var(--md-default-fg-color);
  box-shadow: none;
  border-bottom: 1px solid var(--eor-rule);
}
.md-header__title, .md-header__topic { font-family: var(--eor-display); font-weight: 500; letter-spacing: 0.01em; }
.md-tabs { background-color: var(--md-default-bg-color); color: var(--md-default-fg-color); }
.md-search__form { background-color: var(--md-code-bg-color); }

/* Navigation and table of contents: quiet sans-serif, accent on the active item. */
.md-nav, .md-tabs, .md-footer, .md-source, .md-search, .md-header__button,
.md-typeset .md-button, .md-typeset table:not([class]) th {
  font-family: var(--eor-ui);
}
.md-nav { font-size: 0.68rem; }
.md-nav__link--active, .md-nav__item .md-nav__link--active { color: var(--eor-accent); font-weight: 500; }
.md-sidebar--secondary .md-nav__link--active { border-left: 2px solid var(--eor-accent); padding-left: 0.5rem; margin-left: -0.6rem; }

/* Reading column: generous size and line height, measured width. */
.md-grid { max-width: 76rem; }
.md-typeset { font-size: 0.86rem; line-height: 1.72; }
@media screen and (min-width: 60em) {
  .md-content__inner { max-width: 44rem; margin-left: auto; margin-right: auto; }
}
@media screen and (min-width: 76.25em) { .md-content__inner { margin-left: 1.6rem; } }
body, .md-typeset {
  font-family: var(--md-text-font, "Source Serif 4"), "Source Serif Pro", Georgia, "Times New Roman", serif;
}
.md-typeset h1, .md-typeset h2, .md-typeset h3 {
  font-family: var(--eor-display);
  color: var(--md-default-fg-color);
  letter-spacing: -0.005em;
}
.md-typeset h1 { font-size: 2.35rem; font-weight: 400; line-height: 1.12; margin-bottom: 1.2rem; }
.md-typeset h2 { font-size: 1.45rem; font-weight: 500; margin-top: 2.4rem; padding-top: 1.4rem; border-top: 1px solid var(--eor-rule); }
.md-typeset h3 { font-size: 1.12rem; font-weight: 500; }
.md-typeset hr { border-bottom-color: var(--eor-rule); }
.md-typeset hr + h2 { border-top: 0; padding-top: 0; }
.md-typeset a { text-decoration: none; }
.md-typeset a:hover { text-decoration: underline; text-underline-offset: 0.18em; }
.md-typeset strong { font-weight: 650; }

/* Tables and admonitions: hairlines instead of boxes and shadows. */
.md-typeset table:not([class]) { font-size: 0.74rem; border: 0; box-shadow: none; border-top: 1px solid var(--eor-rule); }
.md-typeset table:not([class]) th { background: transparent; font-weight: 600; border-bottom: 1px solid var(--md-default-fg-color--lighter); }
.md-typeset table:not([class]) td { border-top: 1px solid var(--eor-rule); }
.md-typeset .admonition, .md-typeset details { box-shadow: none; border-width: 0 0 0 3px; background: color-mix(in srgb, var(--md-default-fg-color) 3%, transparent); font-size: 0.8rem; }
.md-typeset .admonition-title, .md-typeset summary {
  background: transparent !important;
  font-family: var(--eor-ui);
  font-weight: 600;
  letter-spacing: 0.01em;
}
.md-typeset code { font-size: 0.82em; }
.md-typeset img { border-radius: 0.25rem; }

/* Colour tokens shared with the Matplotlib figures and Manim scenes. */
:root {
  --eor-feasible: #4c9aff;
  --eor-objective: #f5a623;
  --eor-optimum: #e5484d;
  --eor-binding: #30a46c;
  --eor-muted: #8b8d98;
}

/* Difficulty / track badges used at the top of chapters. */
.eor-badge {
  display: inline-block;
  padding: 0.1rem 0.55rem;
  margin: 0 0.25rem 0.25rem 0;
  border-radius: 1rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border: 1px solid currentColor;
}
.eor-badge.foundation { color: var(--eor-binding); }
.eor-badge.intermediate { color: var(--eor-feasible); }
.eor-badge.advanced { color: var(--eor-objective); }
.eor-badge.production { color: var(--eor-optimum); }
.eor-badge.track { color: var(--md-default-fg-color--light); }

.md-typeset video {
  width: 100%;
  border-radius: 0.3rem;
}

/* ---- LP explorer widget ---------------------------------------------- */
.lp-explorer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1rem 1.5rem;
  padding: 1rem;
  margin: 1rem 0;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 0.4rem;
}
@media (max-width: 44em) {
  .lp-explorer { grid-template-columns: minmax(0, 1fr); padding: 0.6rem; }
  .lpx-row { grid-template-columns: 5.4rem minmax(0, 1fr) 4.2rem; }
}
.lpx-plot { width: 100%; height: auto; }
.lpx-frame { fill: none; stroke: var(--md-default-fg-color--lightest); }
.lpx-feasible { fill: var(--eor-feasible); fill-opacity: 0.28; stroke: var(--eor-feasible); }
.lpx-constraint { stroke: var(--eor-muted); stroke-width: 1.2; }
.lpx-binding { stroke: var(--eor-binding); stroke-width: 2.6; }
.lpx-objective { stroke: var(--eor-objective); stroke-width: 1.6; stroke-dasharray: 6 4; }
.lpx-optimum { fill: var(--eor-optimum); }
.lpx-tick, .lpx-axis { fill: var(--md-default-fg-color--light); font-size: 10px; }
.lpx-axis { font-size: 11px; }
.lpx-controls { display: flex; flex-direction: column; gap: 0.35rem; }
.lpx-row {
  display: grid;
  grid-template-columns: 6.8rem minmax(0, 1fr) 4.8rem;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.72rem;
}
.lpx-row input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  min-width: 0;
  height: 0.3rem;
  margin: 0;
  border-radius: 0.2rem;
  background: var(--md-default-fg-color--lighter);
  cursor: pointer;
}
.lpx-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 0.9rem;
  height: 0.9rem;
  border-radius: 50%;
  background: var(--eor-accent);
  border: 2px solid var(--md-default-bg-color);
}
.lpx-row input[type="range"]::-moz-range-thumb {
  width: 0.9rem;
  height: 0.9rem;
  border-radius: 50%;
  background: var(--eor-accent);
  border: 2px solid var(--md-default-bg-color);
}
.lpx-row input[type="range"]:focus-visible { outline: 2px solid var(--md-accent-fg-color); outline-offset: 3px; }
.lpx-row output { font-variant-numeric: tabular-nums; text-align: right; }
.lpx-reset { align-self: flex-start; margin-top: 0.4rem; font-size: 0.65rem !important; }
.lpx-readout { grid-column: 1 / -1; }
.lpx-readout table { font-size: 0.75rem; margin: 0; }
.lpx-readout th { text-align: left; }
.lpx-readout td { font-variant-numeric: tabular-nums; }

/* Wide display equations scroll inside themselves instead of widening the page. */
.md-typeset div.arithmatex { overflow-x: auto; overflow-y: hidden; }
.md-typeset mjx-container[display="true"] { max-width: 100%; overflow-x: auto; overflow-y: hidden; }

.eor-badge { font-family: var(--eor-ui); }

/* ---- Battery life explorer (Chapter 11) -------------------------------- */
.battery-life-explorer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
  gap: 1rem 1.5rem;
  padding: 1rem;
  margin: 1rem 0;
  border: 1px solid var(--md-default-fg-color--lightest);
  border-radius: 0.4rem;
}
@media (max-width: 44em) {
  .battery-life-explorer { grid-template-columns: minmax(0, 1fr); padding: 0.6rem; }
}
.blx-controls { display: flex; flex-direction: column; gap: 0.35rem; min-width: 0; }
.blx-buttons { margin-top: 0.3rem; }
.blx-readout { font-size: 0.72rem; line-height: 1.45; }
.blx-readout p { margin: 0.35rem 0; }
.blx-plots { display: flex; flex-direction: column; gap: 0.4rem; min-width: 0; }
.blx-plot { width: 100%; height: auto; }
.blx-frame { fill: none; stroke: var(--md-default-fg-color--lightest); }
.blx-title { fill: var(--md-default-fg-color--light); font-size: 10px; }
.blx-tick { fill: var(--md-default-fg-color--light); font-size: 9px; }
.blx-contract { stroke: var(--eor-muted); stroke-width: 1; stroke-dasharray: 4 3; }
.blx-zero { stroke: var(--md-default-fg-color--lighter); stroke-width: 1; }
.blx-yours { fill: none; stroke: var(--eor-feasible); stroke-width: 2; }
.blx-optimal { fill: none; stroke: var(--eor-binding); stroke-width: 1.5; stroke-dasharray: 5 3; }
.blx-aug { fill: var(--eor-objective); }
.blx-cash { fill: var(--eor-feasible); fill-opacity: 0.75; }
.blx-capex { fill: var(--eor-optimum); fill-opacity: 0.75; }
.blx-legend { color: var(--md-default-fg-color--light); }
.blx-key { display: inline-block; width: 1.4rem; height: 0; vertical-align: middle; margin-right: 0.3rem; }
.blx-key.yours { border-top: 2px solid var(--eor-feasible); }
.blx-key.optimal { border-top: 2px dashed var(--eor-binding); }
.blx-buttons .md-button,
.lpx-reset.md-button {
  color: var(--eor-accent);
  border-color: var(--eor-accent);
  font-size: 0.65rem;
  padding: 0.2rem 0.8rem;
}